Trade fair highlight 21. July 2024
Insulation and plastic coating of stators and rotors for electric motors + magnet fixation
Magnet assembly is a crucial step in the production of electric motors, generators and other electrical devices.
Magnet assembly involves a number of steps, from handling the magnets to fixing and integrating them into the end product. Various errors can occur during this process, which can impair the performance of the motor or shorten its service life. The following problems occur with the production technology of bonding magnets:
- Displacement of the magnets during assembly.
- Uneven distribution of the adhesive, resulting in insufficient adhesive force.
- Glue gaps that are too small or too large, which can lead to cracking or uneven magnet placement.
- Damage to the magnets or surface defects during installation, which can lead to loss of performance or corrosion.
The following problems occur when caulking the magnets:
- The design of the disc pack in the area of the recesses requires special attention, as unintentional damage to the brittle magnet material can occur during caulking. It is important to ensure that not only a deformation force acts on the laminated core during caulking, but also forces on the permanent magnets.
- The deformation of the laminated core can cause it to rest against the magnets. This can damage the insulation of the individual laminations, which favours unwanted eddy currents during operation of the electrical machine.
- One challenge is to ensure a process-safe joining gap between the laminated core and the magnet.
The most reliable solution is our injection moulding process for thermoplastics or, if the flow path is not sufficient, our injection moulding process for thermosetting plastics.
Magnet assembly involves a number of steps, from handling the magnets to fixing and integrating them into the end product. Various errors can occur during this process, which can impair the performance of the motor or shorten its service life. The following problems occur with the production technology of bonding magnets:
- Displacement of the magnets during assembly.
- Uneven distribution of the adhesive, resulting in insufficient adhesive force.
- Glue gaps that are too small or too large, which can lead to cracking or uneven magnet placement.
- Damage to the magnets or surface defects during installation, which can lead to loss of performance or corrosion.
The following problems occur when caulking the magnets:
- The design of the disc pack in the area of the recesses requires special attention, as unintentional damage to the brittle magnet material can occur during caulking. It is important to ensure that not only a deformation force acts on the laminated core during caulking, but also forces on the permanent magnets.
- The deformation of the laminated core can cause it to rest against the magnets. This can damage the insulation of the individual laminations, which favours unwanted eddy currents during operation of the electrical machine.
- One challenge is to ensure a process-safe joining gap between the laminated core and the magnet.
The most reliable solution is our injection moulding process for thermoplastics or, if the flow path is not sufficient, our injection moulding process for thermosetting plastics.
MÜHLBEYER Werkzeug- und Formenbau GmbH
Contact
Mr. Stefan Dürr